> scott wrote:
>>>> That's because people who build the stairs works with that order
>>>> of tolerance (mm).
>>>
>>> So... what the hell do you do if you build some stairs, and the 
>>> sement sinks by 0.4 mm while drying? (A perfectly likely outcome.) 
>>> Then each step might be 0.4 mm out...! No noes! o_O
>>
>> Who secures stairs in place by resting them on unset concrete? :-S
> 
> I was thinking more that the *stairs* are made of concrete...

Concrete stairs are usually build in a workshop, poured into
a plywood form, upside-down (so the walking surface is at
the bottom of the form, giving a mostly perfect look and
dimensioning to the visible parts).

Fabien.

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